Soil and Water Conservation Engineering · Fluid Mechanics · 2 marks · Multiple choice
A differential mercury manometer measures two points on an oil pipe and shows 20 cm mercury-level difference. Specific gravities are oil0.8 and mercury13.6. Water density is 1000 kg/m³ and g=9.81 m/s². Find pressure difference in N/m².
For the same-elevation pressure comparison intended, Δp=(ρHg−ρoil)gh=(13600−800)(9.81)(0.20)=25113.60 Pa, C. Subtract the displaced oil-column contribution instead of using mercury density alone.
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